| Abbreviation | Definition |
|---|---|
| COSX | Cabot Corporation (CAB-O-SIL Division) |
| COSX | Cabot Corporation CAB-O-SIL Division |
| COTX | Consolidated Transportation Corporation (GLNX Corporation) |
| COTX | GLNX Corporation |
| COWR | Campbellford, Lake Ontario, & Western Railway |
| COWU | Inguran dba Sexing Technologies |
| COZ | CSX Transportation |
| COZ | CSX Transportation Incorporated |
| CP | Canadian Pacific Railway |
| CP | Canadian Pacific Railway Limited |
| CPAA | Canadian Pacific Railway |
| CPAA | Canadian Pacific Railway Limited |
| CPAX | CITGO Petroleum Corporation |
| CPBU | Soo Line (Canadian Pacific Railway) |
| CPBU | Soo Line Railroad Company |
| CPBZ | Soo Line (Canadian Pacific Railway) |
| CPBZ | Soo Line Railroad Company |
| CPCB | Corporate Courier, Inc. |
| CPCX | Chevron Phillips Chemical |
| CPCX | CPS Chemical Company |